Adjustable positive-measuring pump



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July M, E933., H. T. WHEELER ADJUSTABLE POSTIVE MEASURING PUMP Filed Feb. l5, 1950 2 SheeS-Sl'leefl INI/EN TOR.

Juy M, W33. H. T. WHEELER 1,9l7,678

ADJUSTABLE POSITIVE MEASURING PUMP Filed Feb. 15, 1930 2 Shees-Sheetl 2 f E E lllllllllllllll Illlll l INVENTOR.

become apparent the description proceeds r i l i 7,

the accompanying' Patented July 11, 1933 unirse srATEs PATENT OFFICE HARLEY T. VIEEELER, 0F DALLAS, TEXAS, ASSGNOR T0 ELIZABETH DALLAS, TEXAS WHEELER, 0F

ADJUSTABLE PSTIVE-MEASURING PMP' Application filed February 15, 1930. Serial No. 428,752.

This invention relates to vacuum pumps, more particularly to certain new and useful improvements in attachments for positive measuring` pumps for use. in dispensing syrup jars found in standard soda fountains, and its vprincipal object resides in its capability oi' quickly predetermining different quantities of liquid to be dispensed at each operation, thus effecting a saving' by delivering the (plant-ityv desired.

Another object of' the invention arises from a novelty of structure, particularly the quickly adjustable method of changingr the stroke of theV reversible mechanism during each stroke 'if necessary,`which in connection .vitli a visible dial makes possible the immediate and aecurate discharge of any quantity of syrup Within the range of the pump capacity.

Still another andimportant obj-ect is the resetting device by which the reversible rod may be returned to starting, point from any point less than a full stroke, Without cenipletinpthe full stroke and the returning strate.` f l 'lilith these objects and advantages in view, other objects as Well as certain features of construction and arrangement of parts Will taken in connection with drawings, wherein:

Figure 1 is a side elevation in vertical cross-section of the pump and attachments built according` to this invention.

Figure 2 is an end elevation in cross-section of the reversing` mechanism and the attachments. l

Figure 3 is a plan `view sind cross-section in part or the resetting` device, along lines DD of Figures 2. V

Figure is a plan view of the'visible dial graduated in fluid ounces.

`Figure 5 is a horizontal cross-section of the dial along; the lines'AA of Figure 1.

Figure G is a side elevation of the dial' and its spring.

1 Figure 7 is a horizontal cross-section of the multi-threaded nut'and its housing, along lines BP) of Figurel.

Figure S is af horizontal cross-section of the ings, it will be observed in Figure 1 that the pumpV parts kare moulded to the top to form a frame- Which supports the pump pistonand they reversing` mechanism.

pairing and Cleaning.

The pump is so constructed as to be operative in the usual syrup jar which forms a part of the standard soda fountain equip ment, without alteration of the equipment, and may be adj usted as will presently become apparent to dispense any quantity of liquid desired, Within the limits for Which the pump is desioned. The top 11 will lit over the neck of a standard kpump jar, holding the pump cylinder 1 justr oil the bottom of the jar 9, so that the pump valve 6 Willadmit syrup on the suction stroke. The piston 10 is a close lit to the walls of the cylinder 1; the piece 5 forms the cylinder head and contains a suction valveG. The support 2 and the delivery tube 3 form the supports to the top 11; the tube 3 is extended to form the nozzle 4, the liquid being discharged thru the latter. To make this a positive measuring pump, a valve body 7 and a valve 8 are used to prevent seepage of the liquid back thru the fits between -he surface of the piston 10 and the Walls of cylinder 1.

The piston 10 is attached to the rod 12, ther latter having formed on its face indent-ations in vwhich the detent 15 may rest. It is apparent 'that on the rip-stroke the detent 15 in one extremeposition will trail and vibrate until the sleeve 13 forces the detent to reverse, so permitting' aireturn stroke. VWhen the upstroke is completed, the downstrokemay be started, the detent ltrailing and vibrating until forced by the sleeve 26 to reverse. The detent 1 5 is pivotly attached to the bearing 14 by a pin 16; this same detent resides in a slot cut in the bearingldand has a clearance on lthe top and bottom for movement. The cross-section of the three parts 17, 18 and 19 is a part of the bearing r14and the sectionV is to one side of the slot in Which the detent 1 5 resides.y The cross-piece 17 is sharpened As is apparent the pump parts are readily removable for ree on the lower edge to alternately maintain the detent 15 in one or the ot-her of its two extreme positions by pressing against the side ofthe pointed extension of the detent. The spring 18 is held in place by a screw 19 and provides the reaction necessary to operate the crosspiece 17. The bearing 14 forms a housing for the detent 15, being a close lit on the sides of the detent but permitting movement in an up and down direction, and is a guide for the piston rod 12. The piece 21 is threaded on its upper portion to receive the cap 22, and at its lower portion is iiXed to the top 11.

Referring now especially to the means for controlling the stroke, attention is particularly directed to the cross-sections of the Figures 1 and 2. The sleeve 26 which reverses the detent mechanism is mounted on a multi-threaded nut 28, so that the length of the stroke may be varied at will and in accordance with a dial shown in Figure 11. All positive stroke pumps as now made have intricate adjustments for stroke length so that the operator cannot change the delivery unless he has been provided with special wrenches, and some time must be taken for the work. There is, however', the necessity7 of mixing syrups of various quantities to conform with the desires of customers, rarely any two mixtures alike. The proportions desired of two or more syrups are at present dispensed by guesswork only when taken from a plain pump, and cannot be dispensed from a positive measuring pump without wasting the syrup. To enable the operator to deliver into a container fractional amounts of several syrnps so that the resulting syrup will be tasty as desired, this invention makes possible by permitting the operator `to set the pump at the desired full stroke for each kind of syrup.

A portion of the rod 12 is reduced to a circular cross-section forming a shoulder-fit as at 30; a multi-threadednut 28 rests on this projection, better shown in the cross-section of Figure 7 The sleeve 26 is correspondingly threaded and is held in a fixed radial position to the rod 12 by the washer 27, whose ears lit into slots of the sleeve 26, as is also shown in Figure 8. Thus when the nut 28 is rot-ated, the sleeve 26 rises or falls without rotation. The washer 27 is held against the nut 28 by the constant tension of the spring 25. The housing l29 protects and covers the sharp edges of the sleeve 26 andis held in place between the parts 28 and 31 by the adjusting nut 31, the latter being fixed to the squared extension of the rod 12 by the screw 33. As shown in Figure 5, the upper end o f the rod 12 is reduced to a rectangular cross-section to prevent the dial body 32 from rotating; the dialbody 32 is also held against a shoulder on the rod 12 so formed by the screw 33.V It should be apparent that when the nut 31 is rotated, the dial body 32 is stationary, yet the sleeve 26 will rise or fall to change the point of the stroke at which the detent mechanism will be reversed.

Referring now to Figure 4, the dial face 34 is calibrated in terms of liquid measurement, calculated from portions of the piston stroke. The normal position of the nut 31, the wing pointing toward the nozzle, is shown as one liquid ounce. A clockwise movement reduces the stroke, anti-clockwise increasing it. Referring now to Figure 5 again, at each division shown, a spring 3G attached to the dial body 32 by a rivet 37, drops into the recesses made on the inner surface of the nut 31 and opposite to the graduations made on the face of the dial 34. This insures maintenance ofthe stroke as it is set, until changed to another point. Figure G shows a plan view of the spring 36 mounted on the dial body 32 by a rivet 37.

There are other operations in soda dispensing beside accurate measurement of quantities of syrup by control of the pump stroke, notably dispensing a quantity into a container to a certain level, an unknown quantity being in the container to begin with. To eilect this, and yet be able to return the pump piston to its normal starting point, a resetting device isk applied as shown in Figures 1, 2 and 3. T he sleeve 23 is concentric with the sleeve 26 and is caused by the body 22. The sleeve 23 is held tensioned in an upper position by the spring 35 attached to the body 22 by rivets 39, 39, pressing against ears 40rwhich are attached to the sleeve 23. The sleeve 23 is forced into contact with the reversing detent 15 by a lever 21, litt-ing the exposed top of the sleeve 23 and being hinged to the cap 22 by a rivet 38. It should be apparent that the resetting device operates independently of the sleeve 26 or of the setting of the dial 34.

Tn operation of the dial, the normal position of the wing of the nut 31 is toward the nozzle, giving the average dispensation of syrups, one liquid ounce for example. In mixing drinks or dispensing an eXtra large portion, the dial is rotated to the desired position, being there held by the spring 36 pressing into a depression of the nut 31. The position of the sleeve 26 so set, predetermines the stroke by reversing the detent mechanism at the point corresponding to the liquid measurement shown on the dial 311. For those operations before mentioned, after which the pump piston is left at a partial position of the stroke as set, the reversing detent mechanism may be reset by the lever 24 operating the sleeve 25, thus permitting the spring 25 to return the piston to its uppermost position.

It should be apparent that while the mechanism covered by this invention has been shown applied to a reversing detent, the principle may be applied to other types of positive measuring pumps. ing no reversible motions, the effect ot applying the invent-ion is a method of quickly changing the length ot' the stroke. And it should also be apparent that by the applica tion of ay special and a positive lock between the nut 3l and the dial body 32, the pump becomes a positive measuring pump of fixed stroke.

Manifestly, the construction illustrated and described is capable of considerable variation and such variation as is withinthe scope ot the appended claims is considered within the spirit ot the invention.

l claim:

l. In a pump, a cylinder having a piston and a piston rod therein, a series ot teeth formed on said piston rod, a double-pointed detent pivotally situated at a fixed point with relation to the pump frame, eitherl point of said detent engageable with the series ot teeth on said rod, a pointed projection on the detent contacting' with a sliding` spring-actuated pawl to hold the de tent in either ot' its extreme positions, a spring-tenw On pumps havsioned threaded spool rotatively positioned on the upper end ot said rod, a Washer in a lixed position on said piston rod With exten sions into axial grooves of a sleeve, said sleeve threaded to tit said threaded spool; a dial fixed to the upper end oi" the piston rod and its circumference visibly graduated in terms ot' piston stroke, the periphery ot' said dial residing Within an annular groove oit a winged nut, said Winged nut attached to said threaded spool, rotation of the Winged nut and threaded spool assembly varying'the distance of the end oi said threaded sleeve with respect to the position ot said detent; said threaded sleeve in motion contacting With one tace of said detent to reverse rit at a point predetermined according to thek lation to the pump frame, either point of said detent engageable with the series of teeth on said rod, means to hold the detent rin either of its extreme positions; a spring tensioned threaded spool rotatively positioned on the upper end of said rod, a sleeve threaded to lit said threaded spool and means to position said sleeve radially with respect to said rod; a dial fixed to the upper j end ot said rod and its circumference visibly graduated in terms et' piston stroke, a winged nut housing' the periphery of said dial and attached to said threaded uut, rotation ot the Winged nut and threaded spool assembly varying the distance of the end of said threaded sleeve With respect to the position of said detent; said threaded sleeve in motion contacting` with one face of said detent to reverse it at a point predetermined according to the ,Graduation of the visible dial in terms ot piston stroke; aV secondary sleeve concentric with said threaded sleeve operatable by a lever from an exterior point of the pump trame, to Contact with one face of said detent to reverse it and permit a return stroke of said rod from any point less than the predetermined stroke.

In testimony whereof I have name to this speciiic'ation.

HARLEY T. VHEELER.

signe d my 

